I have had this one as well and what i think it is if you stick the player in the dash and then start the car if your timing is just right the plyer is not found as every time my tuner has turned invisible the battery sysmbol has been up from a car start.

Start car and then plug in player and see if it happens.
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P.Allison fixer of big engines Mk2+Mk2a signed by God / Hacked by the Lord Aberdeen Scotland